device_cgroup: prepare code for bpf-based device controller
This is non-functional change to prepare the device cgroup code for adding eBPF-based controller for cgroups v2. The patch performs the following changes: 1) __devcgroup_inode_permission() and devcgroup_inode_mknod() are moving to the device-cgroup.h and converting into static inline. 2) __devcgroup_check_permission() is exported. 3) devcgroup_check_permission() wrapper is introduced to be used by both existing and new bpf-based implementations. Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Tejun Heo <tj@kernel.org> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roman Gushchin
David S. Miller
Родитель
67e306fdbe
Коммит
ecf8fecb78
|
|
@ -1,17 +1,70 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
#include <linux/fs.h>
|
||||
|
||||
#define DEVCG_ACC_MKNOD 1
|
||||
#define DEVCG_ACC_READ 2
|
||||
#define DEVCG_ACC_WRITE 4
|
||||
#define DEVCG_ACC_MASK (DEVCG_ACC_MKNOD | DEVCG_ACC_READ | DEVCG_ACC_WRITE)
|
||||
|
||||
#define DEVCG_DEV_BLOCK 1
|
||||
#define DEVCG_DEV_CHAR 2
|
||||
#define DEVCG_DEV_ALL 4 /* this represents all devices */
|
||||
|
||||
#ifdef CONFIG_CGROUP_DEVICE
|
||||
extern int __devcgroup_inode_permission(struct inode *inode, int mask);
|
||||
extern int devcgroup_inode_mknod(int mode, dev_t dev);
|
||||
extern int __devcgroup_check_permission(short type, u32 major, u32 minor,
|
||||
short access);
|
||||
#else
|
||||
static inline int __devcgroup_check_permission(short type, u32 major, u32 minor,
|
||||
short access)
|
||||
{ return 0; }
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_CGROUP_DEVICE
|
||||
static inline int devcgroup_check_permission(short type, u32 major, u32 minor,
|
||||
short access)
|
||||
{
|
||||
return __devcgroup_check_permission(type, major, minor, access);
|
||||
}
|
||||
|
||||
static inline int devcgroup_inode_permission(struct inode *inode, int mask)
|
||||
{
|
||||
short type, access = 0;
|
||||
|
||||
if (likely(!inode->i_rdev))
|
||||
return 0;
|
||||
if (!S_ISBLK(inode->i_mode) && !S_ISCHR(inode->i_mode))
|
||||
|
||||
if (S_ISBLK(inode->i_mode))
|
||||
type = DEVCG_DEV_BLOCK;
|
||||
else if (S_ISCHR(inode->i_mode))
|
||||
type = DEVCG_DEV_CHAR;
|
||||
else
|
||||
return 0;
|
||||
return __devcgroup_inode_permission(inode, mask);
|
||||
|
||||
if (mask & MAY_WRITE)
|
||||
access |= DEVCG_ACC_WRITE;
|
||||
if (mask & MAY_READ)
|
||||
access |= DEVCG_ACC_READ;
|
||||
|
||||
return devcgroup_check_permission(type, imajor(inode), iminor(inode),
|
||||
access);
|
||||
}
|
||||
|
||||
static inline int devcgroup_inode_mknod(int mode, dev_t dev)
|
||||
{
|
||||
short type;
|
||||
|
||||
if (!S_ISBLK(mode) && !S_ISCHR(mode))
|
||||
return 0;
|
||||
|
||||
if (S_ISBLK(mode))
|
||||
type = DEVCG_DEV_BLOCK;
|
||||
else
|
||||
type = DEVCG_DEV_CHAR;
|
||||
|
||||
return devcgroup_check_permission(type, MAJOR(dev), MINOR(dev),
|
||||
DEVCG_ACC_MKNOD);
|
||||
}
|
||||
|
||||
#else
|
||||
static inline int devcgroup_inode_permission(struct inode *inode, int mask)
|
||||
{ return 0; }
|
||||
|
|
|
|||
|
|
@ -15,15 +15,6 @@
|
|||
#include <linux/rcupdate.h>
|
||||
#include <linux/mutex.h>
|
||||
|
||||
#define DEVCG_ACC_MKNOD 1
|
||||
#define DEVCG_ACC_READ 2
|
||||
#define DEVCG_ACC_WRITE 4
|
||||
#define DEVCG_ACC_MASK (DEVCG_ACC_MKNOD | DEVCG_ACC_READ | DEVCG_ACC_WRITE)
|
||||
|
||||
#define DEVCG_DEV_BLOCK 1
|
||||
#define DEVCG_DEV_CHAR 2
|
||||
#define DEVCG_DEV_ALL 4 /* this represents all devices */
|
||||
|
||||
static DEFINE_MUTEX(devcgroup_mutex);
|
||||
|
||||
enum devcg_behavior {
|
||||
|
|
@ -810,7 +801,7 @@ struct cgroup_subsys devices_cgrp_subsys = {
|
|||
*
|
||||
* returns 0 on success, -EPERM case the operation is not permitted
|
||||
*/
|
||||
static int __devcgroup_check_permission(short type, u32 major, u32 minor,
|
||||
int __devcgroup_check_permission(short type, u32 major, u32 minor,
|
||||
short access)
|
||||
{
|
||||
struct dev_cgroup *dev_cgroup;
|
||||
|
|
@ -833,37 +824,3 @@ static int __devcgroup_check_permission(short type, u32 major, u32 minor,
|
|||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int __devcgroup_inode_permission(struct inode *inode, int mask)
|
||||
{
|
||||
short type, access = 0;
|
||||
|
||||
if (S_ISBLK(inode->i_mode))
|
||||
type = DEVCG_DEV_BLOCK;
|
||||
if (S_ISCHR(inode->i_mode))
|
||||
type = DEVCG_DEV_CHAR;
|
||||
if (mask & MAY_WRITE)
|
||||
access |= DEVCG_ACC_WRITE;
|
||||
if (mask & MAY_READ)
|
||||
access |= DEVCG_ACC_READ;
|
||||
|
||||
return __devcgroup_check_permission(type, imajor(inode), iminor(inode),
|
||||
access);
|
||||
}
|
||||
|
||||
int devcgroup_inode_mknod(int mode, dev_t dev)
|
||||
{
|
||||
short type;
|
||||
|
||||
if (!S_ISBLK(mode) && !S_ISCHR(mode))
|
||||
return 0;
|
||||
|
||||
if (S_ISBLK(mode))
|
||||
type = DEVCG_DEV_BLOCK;
|
||||
else
|
||||
type = DEVCG_DEV_CHAR;
|
||||
|
||||
return __devcgroup_check_permission(type, MAJOR(dev), MINOR(dev),
|
||||
DEVCG_ACC_MKNOD);
|
||||
|
||||
}
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче